Device for transforming a rotary motion into a linear reversing motion, particularly for textile machines

ABSTRACT

A device for transforming a rotary motion into a reciprocatory linear motion. The device is useful, for example, for use as a yarn laying traverse mechanism for textile machines such as winding machines. Two spaced parallel cylinders are driven, usually at constant speed. The cylinders are provided with helical grooves, corresponding elements of which are in transverse alignment. A yarn guide member is mounted for travel between and longitudinally of the cylinders. The yarn guide member is provided with a transversely slidable pin; means is provided for shifting one end of the pin into the helical groove in one of the cylinders at the end of a forward stroke of the guide member, and for shifting the other end of the pin into the helical groove in the other of the cylinders at the end of the reverse stroke of the guide member.

[451 May 9,1972

United States Patent Kacalek et al.

ROTARY MOTION INTO A LINEAR 284,158 1/1928 GreatBritain.............................74/58 REVERSING MOTION, PARTICULARLYFOR TEXTILE MACHINES [72] Inventors:

Primary E.\'aminerWilliam F. ODea Josef Kacalek; Josef Banos; Mimslavjssislant Exmlginelggesley S. Ratliff, Jr. Stransky, all of Usti NadOrlici, Czechoslovakia ABSTRACT [73] Assignee: Elitex, Zavody textllnihostrojirenstvl,

Liberec Czechoslovakia A device for transforming a rotary motion into areciprocatory linear motion. The device is useful, for example, for useas a Flledl y 7, 1970 yarn laying traverse mechanism for textilemachines such as winding machines. Two spaced parallel cylinders aredriven, usually at constant speed. The cylinders are provided withhelical grooves, corresponding elements of which are in trans- [21]Appl. No.:

'm74/58 verse alignment. A yarn guide member is mounted for travel'F16h25/12 between and longitudinally of the cylinders. The yarn guide74/58 57 member is provided with a transversely slidable pin; means isprovided for shifting one end of the pin into the helical groove in oneof the cylinders at the end of a forward stroke of the guide member, andfor shifting the other end of the pin into [51] Int. [58]FieldofSearch.....................

References Cited the helical groove in the other of the cylinders at theend of the reverse stroke of the guide member.

4 Claims, 10 Drawing Figures m m a f Ea SG 379 266 999 uww Mum 275 746133 ill ll ll ll llllll'lllll llllll ll] 1 llllllllll] PATENTEDMAT 9I972 3, 661 O 1 9 sum 1 OF 2.

l V I I/ gose KACALEK ATTORNEY PATENTEDMAY 9:972 3,661,019

SHEET 2 OF 2 /NVENTORS'- ma/Q ATTORNEY DEVICE FOR TRANSFORMING A ROTARYMOTION INTO A LINEAR REVERSING MOTION, PARTICULARLY FOR TEXTILE MACHINESThe present invention relates to a device for transforming a rotarymotion into a linear reversing motion; it is particularly useful fortextile machines, as e.g., winding, twisting, texturing and similarmachines.

Many devices are known for transforming rotary motion to linear motion,of which, however, only a few are applicable to textile machines. Mostfrequently, winding drums, winding eccentrics, winding cylinders withreverse grooves or even two winding cylinders with reversing helicalgrooves, in which the crossing points are mutually overset, are known.

The winding drums are used for winding classical materials, e.g. cotton.They can also be used for winding textured yarns from synthetic fibers.The advantage of the winding drums consists in that they are simple intheir construction and thus operate without failures; on the other hand,however, they have also disadvantages consisting particularly of thefact that they are not suitable for winding smooth and fine yarns ofsynthetic fiber because it is impossible to shorten the winding strokesfor forming inclined front surfaces on windings; such windings are usedwhen the yarn is to be further processed, as, for example, in knittingmachines.

Winding eccentrics are used particularly for precise cross windingmachines for synthetic yarns, in which also the winding stroke can beshortened; this device thus meets the requirements as to the shape andconstruction of the winding. The disadvantage of such device consists inthat when a winding 200 to 250 mms long is required, which is a usualrequirement in view of the present winding speeds, a winding eccentricof large size must be used. This, however, prevents the achievement ofthe necessary operating speed, as well as the necessary high frequencyof reciprocation of the yarn guide, in view of the considerable mass ofthe reciprocating parts.

Winding cylinders with a reverse helical groove may also be used in thesame cases as the above-described eccentric. The said winding cylindersovercome the main disadvantages of the winding eccentrics. In thepresent state of the art, these devices are most suitable as sources oflinear reverse motion, and are also most frequently used. The dimensionsof this device are advantageous as compared with those of the dimensionsof the winding eccentric, and by means of the said device higher windingvelocities and a higher frequency of strokes of the yarn guide can beachieved. However, on the other hand, this device also has certaindisadvantages compared with the winding eccentric. These disadvantagesarise from the fact that the cylinder is provided on its surface with agroove having a left and a right pitch, thus causing the presence ofsocalled crosses upon mutual intersection of the said grooves. For thatreason, it is impossible to make the groove as a simple one, as in thecase of the winding eccentric; thus the groove must be made doubled,i.e., e.g. two grooves above each other, the upper larger and thecoaxial, lower groove narrower. In the lower groove there is guided awing which entrains the slider through the groove crosspoints. It is,however, necessary to alter the configuration of the lower groove at thedead centers, so as to enable the wing to pass the small radius of thedead center; at the dead center the sliding element is guided in theupper wide groove by means of a roller. In the cylinders with groovesmade as mentioned above, then the linearily vibrating mechanism which isdriven by the wing, is made to oscillate at the crosspoints of thegrooves and its operation is unsteady. Moreover, it is necessary toconsider that at the dead center the wing passes through the alteredgroove, this making its movement uncontrollable and causing impacts andvibrations. These disadvantages reduce the accuracy of yarn distributionon the bobbin, and also reduce the operating life of the mechanisms;they cause noisy operation, and make further increase in the frequencyof reciprocation of the yarn guide impossible. The wing, as well as thedouble groove, are also very intricate and expensive from the viewpointof manufacture.

Another device with two winding cylinders with reversing helical groovesis known, in which the crosspoints of the grooves are mutually overset.That means, that the pitch of the grooves of the two cylinders is notthe same, the pitch ratio of the two grooves being an irreduciblefraction. This device overcomes the main disadvantage of the windingcylinder with a reversing groove. This device does have, however, animportant disadvantage; it is not suitable for a higher frequency ofstrokes on the winding cylinders, as the mutual interception of thecrosspoints would be in this case so imperceptible, that its originalpurpose would be lost. The most suitable ratio of the pitches of saidgrooves is, in that embodiment, l.5 2. A further substantialdisadvantage, however, consists in that the device is not suitable forwindings longer than 200 to 25 0 mms; in view of the number of groovepitches, it is necessary to choose cylinders of larger diameter in viewof the pitch of said groove, this making it impossible to achieve inthat device the necessary velocities and the necessary frequency ofdouble strokes of the guide. A further substantial disadvantage consistsin that the manufacture of grooves on the cylinders is difficult,particularly at the crosspoints, and rather expensive.

The present invention has for its object the overcoming of thedisadvantages set out above, thus enabling the achievement of a higheroperating speed of the device. In the illustrative embodiment of thedevice according to the present invention the two winding cylinders areinterconnected by a driving transmission, and are provided each with onehelical guiding groove. The opposite ends of each groove are situated inopposite directions axially past the respective dead centers. A drivingpin in the sliding element alternately engages one of said grooves andthen the other, depending upon the instan taneous direction of movementof the sliding element.

Further features of the device according to the present invention aredescribed in the following specification and shown in the accompanyingdrawings in the form of several embodiments, of which FIG. 1 is a viewin plan of a first illustrative embodiment of the device according tothe present invention;

FIG. 2 is a view in cross section of the device as shown in FIG. 1, thesection being taken along the line 2-2 of FIG. 1;

FIG. 3 is a view in cross section similar to that of FIG. 2, but withanother, second embodiment of the grooves;

FIG. 4 is a view in cross section similar to that of FIG. 2, but withanother, second embodiment of the sliding element;

FIG. 5 is a view in cross section similar to that of FIG. 4, but withthe embodiment of grooves shown in FIG. 3 and with the embodiment of thesliding element shown in FIG. 4;

FIG. 6 is a view in plan of a further embodiment of the device accordingto the present invention, parts of the apparatus being shown in section;

FIG. 7 is a view in cross section of the device shown in FIG. 6, thesection being taken along line 77 of FIG. 6;

FIG. 8 is a view in cross section of the device similar to that of FIG.7 but with another embodiment of the drive;

FIG. 9 is a view in cross section of the device similar to that shown inFIG. 7 with another embodiment of the sliding element; and

FIG. 10 is a cross section of the device shown in FIG. 6, but with theembodiment of the drive shown in FIG. 8, and with v the embodiment ofthe sliding element shown in FIG. 9.

Turning first to FIGS. 1 and 2, the device according to the presentinvention has two parallel winding cylinders l and 2, each cylinderbeing mounted at each end in bearings as shown. One of the said windingcylinders is connected to a driving power source (not shown). Thewinding cylinders are provided with identical helical guiding grooves 3,3' of the same pitch direction. The winding cylinders 1 and 2 arepositively geared together to rotate in synchronism and in the samephase by gears 11 and 12. Between the two winding cylinders l and 2parallel guiding rods 10 and 10' are mounted parallel to cylinders 1, 2.A sliding element 9 is mounted on rods 10, 10'. Element 9 has atransverse bore therein at substantially the center of sliding element9. A driving pin 8 is slidably mounted in the transverse bore. Pin 8alternately engages and is linearly driven by groove 3 of windingcylinder 1 and groove 3 of winding cylinder 2. The helical guidinggrooves 3 and 3' are made such that their ends are located axiallybehind the dead centers, i.e. beyond points 4 and 5 on the cylinder 1and beyond points 6 and 7 on the cylinder 2, the end portions of thegrooves extending in the direction opposite to that of the main extentof grooves 3 and 3' without intersecting them. In the embodiment shownin FIGS. 1 and 2, the helical guiding grooves 3, 3' become progressivelyshallower as they approach both dead centers 4 and 5 or 6 and 7,

respectively, until they reach substantially zero depth at the deadcenters. Beyond the dead centers, the grooves progressively increase indepth to their ends, as shown, such end portions extending in oppositeaxial directions.

According to the variation as shown in FIG. 3, it is, however, alsopossible that the helical guiding groove 3 of the winding cylinder 1 isof substantially zero depth only at the dead center 4, whereas thehelical groove 3' of the winding cylinder is of substantially zero depthat the dead center 7, i.e. a the opposite side. However, it is alsopossible tochoose the dead center 5 of winding cylinder 1 and the deadcenter 6 of winding cylinder 2 for the same purpose. In both cases, thereliability of the function performed by the device according to thepresent invention is maintained.

The device according to the present invention in the embodiment as shownin FIGS. 1 to 3 operates as follows:

The guide 9, provided with a driving pin 8 engaging the helical guidinggroove 3 of the rotating winding cylinder 1 is displaced along theguiding rods 10 and 10' by rotation of the winding cylinder 1 in thedirection of arrow 5,. As soon as the driving pin 8 reaches the deadcenter 4 of the helical guiding groove 3, which at this point isdirected onto the surface of winding cylinder 1, said pin is transferredby the action of the continuous decrease of depth of groove 3 into thegroove 3' of winding cylinder 2, which rotates, due to the directengagement of gear 12 mounted thereon with gear 11 of winding cylinder1, which rotates in the opposite direction from cylinder 1. Thereuponthe guide 9 is displaced on the guiding rods 10 and 10' by motion of thedriving pin 8 in the groove 3' of the winding cylinder 2 in thedirection of arrow S Such motion continues as far as dead center 7 ofgroove 3', where said pin 8 is again transferred, upon continuousshallowing of the groove 3' on winding cylinder 2, to the guiding groove3 of the winding cylinder 1 and the whole cycle is repeated.

In FIGS. 4 and 5, two variations of the device as shown in FIGS. 1 to 3are shown; such variations have another embodiment of the guide, theredesignated 9. The guide 9' is, in both cases as shown in FIGS. 4 and 5,provided on both sides with recesses 18 and 18' of arcuate shape, suchrecesses receiving the winding cylinders 1 and 2 and replacing thefunction of guiding rods l0, 10, which thus need not be used. Guide 9'is provided approximately in its center with a transverse bore, in whicha driving pin 8 is slidable; pin 8 alternately engages and is linearlydriven by the helical guiding groove 3 of winding cylinder 1 and thehelical groove 3' of winding cylinder 2.

In the variation of the embodiment as shown in FIGS. 4 and 5, the deviceoperates in generally the same manner as the embodiments of FIGS. 1 to3, the only difference being that guide 9 is displaced with its arcuaterecesses 18 and 18' along the winding cylinders I and 2, the windingcylinders themselves coacting with recesses 18 and 18', servingaccurately to guide the guide member 9' in its reciprocation.

The embodiment of the device according to the present invention shown inFIG. 6 is constituted by two winding cylinders I5, 16, mounted withtheir two ends in bearings and driven from a source of rotary drivingpower (not shown). The winding cylinders 15 and 16 are provided withhelical guiding grooves 17, 17', respectively, the said grooves having amutually opposite direction of pitch, i.e. cylinder 15 being providedwith a right and cylinder 16 with a left helix, or vice versa. Thegrooves 17 and 17' are of uniform radial depth in their main courses, aswell as in their end portions behind or beyond their dead centers 19 and20, and 21 and 22. Such end portions of the grooves extend in adirection opposite to the course of grooves 17 and 17' withoutintersecting them. Between the winding cylinders 15 and 16 there aremounted one above the other guiding rods 10 and 10' on which the guide 9is mounted. The guide 9 is provided approximately at its center with atransverse bore in which a driving pin 8' is slidably mounted. Besidethe guiding rods 10 and 10' at the points of dead center 19 and 22, or20 and 21, stop members 14 and 14', respectively, are mounted, the stopmembers being fastened in a housing (not shown) of the whole mechanism.The driving pin 8 is reciprocated between the left hand positionthereof, shown at the top in FIG. 6, and a right hand position (notshown) when the guide 9 has reached its lowermost position. For thispurpose, the guide 9' is provided with an opening centrally therethroughextending parallel to cylinders 15, 16. The noses of stop members 14,14', which are slanted in opposite directions, alternately engageopposite ends of the opening in guide member 9, thereby to reciprocatesuch member, as described.

The drive in that embodiment is derived from a rotary power source (notshown). Because the winding cylinders 15, 16 must be driven, in contrastto the preceding embodiment, in the same direction, the drive is made inthe manner shown in FIG. 7; a toothed or Timing belt 23 is used fortransmitting the motion from the power source to winding cylinders 15and 16, said belt partially surrounding a toothed pulley 11" on thewinding cylinder 15, as well as a toothed pulley 12" on winding cylinder16.

In the embodiment shown in FIG. 8, a gear 13 is connected to the rotarydriving source, said gear 13 meshing with a gear 11' affixed to windingcylinder 15 and with a gear 12' affixed to winding cylinder 16.

In the embodiment as shown in FIGS. 6 to 8, the device according to thepresent invention is as follows:

The guide 9 with the drive pin 8', which engages the helical guidinggroove 17 of the rotating winding cylinder 15, is displaced on theguiding rods l0, 10' in the direction of arrow S As soon as the drivingpin 8' reaches the proximity of the dead center of groove 17 of thewinding cylinder 15, its groove 8a comes into contact with stop member14 which, with its chamfered surface, transfers the driving pin 8'gradually to the opposite side as long as its is at the point of deadcenter of groove 17 of winding cylinder 15. The driving pin 8' istransferred into the helical guiding groove 17 of the winding cylinder16, which drives pin 8' together with guide 9 on the guiding rods 10, 10in the direction of arrow 8,, as far as the proximity of dead center 21of guiding groove 17' of the winding cylinder 16. Here the guiding pin 8touches with its groove 8a the stop member 14 and the whole process isrepeated. In that embodiment, the two winding cylinders 15 and 16 mustrotate in the same direction; however, their guiding grooves 17, 17'have opposite directions of pitch, as shown.

The embodiments as shown in FIGS. 9 and 10 are variations of theembodiments as shown in FIGS. 7 and 8. The guide 8', used in FIGS. 9 and10, is shown in FIGS. 4 and 5. The guide 9 is provided with recesses 18and 18 of arcuate shape at its opposite ends. Said guide 9 is mounted onwinding cylinders 15 and 16, which thus replace the guiding rods 10 and10'. Guide 9' is provided at approximately its center with a transversebore in which the driving pin 8 is slidably mounted.

In the variations of the embodiment as shown in FIGS. 9 and 10, also,this device according to the present invention operates substantially inthe same manner as previously described embodiments. The guide 9' slideswith its arcuate recesses 18 and 18 along the winding cylinders 15 and16, which rotate in the same direction (FIG. 9) or opposite (FIG. 10)directions. The driving pin 8 is alternately positioned in the guidinggroove 17 of the winding cylinder 1, or in the guiding groove 17 of thewinding cylinder 16.

The advantages of the device according to the present invention consistparticularly in that the manufacture of cylinders with simple grooves issimpler, the device operates at a lower noise level, and a higherfrequency of double strokes can be achieved therewith. This results inan increased lifetime of the whole mechanism. In view of the possibilityof manufacturing cylinders of small diameter, it is also possible to usethem simultaneously as guideways for the guide.

Although the present invention has been described in conjunction withpreferred embodiments, it is to be understood that modifications andvariations may be resorted to without departing from the spirit andscope of the invention, as those skilled in the art will readilyunderstand. Such modifications and variations are considered to bewithin the purview and scope of the invention and appended claims.

What is claimed is:

l. A device for transforming a rotary motion to a reciprocatory linearmotion, comprising two transversely spaced parallel rollers, meansdrivingly to connect the rollers to rotate in synchronism, a helicalguiding groove in each roller, a guide member mounted between therollers for reciprocation parallel thereto, a drive pin mounted on theguide member for reciprocation transversely of the rollers, means forshifting the drive pin at the ends of its strokes so that the pindrivingly engages the groove in one roller during the forward stroke ofthe guide member and drivingly engages the groove in the other rollerduring the reverse stroke of the guide member, and means at thelongitudinally opposite ends of the device for stopping the guide memberat the ends of its operative strokes, the means for shifting the drivepin so that it alternately engages the grooves in the opposite rollerscomprising means on the driving pin engaged by the respective stop meansat the ends of the operative strokes of the guide member.

2. A device according to claim 1, wherein the drive pin has a passagetherethrough directed parallel to the rollers, and wherein theconfronting axially inner ends of the stop members are bevelled inopposite directions, the peaks of the stop members being receivablewithin the passage in the pin whereby to thrust the pin in oppositedirections at the ends of successive operative strokes of the guidemember.

3. A device for transforming a rotary motion to a reciprocatory linearmotion, comprising two transversely spaced parallel rollers, meansdrivingly to connect the rollers to rotate in synchronism, a helicalguiding groove in each roller, a guide member mounted between therollers for reciprocation parallel thereto, a drive pin mounted on theguide member for reciprocation transversely of the rollers, and meansfor shifting the drive pin at the ends of its strokes so that the pindrivingly engages the groove in one roller during the forward stroke ofthe guide member and drivingly engages the groove in the other rollerduring the reverse stroke of the guide member, the guide member havingtwo oppositely disposed recesses, one at each of its transverse ends,said recesses accurately receiving the respective rollers whereby therollers guide the guide member in its reciprocation.

4. A device according to claim 3 wherein the recesses have part-circularcylindrical guiding surfaces disposed with their axes parallel to theaxes of the rollers, the rollers are of circular cylindricalconfiguration with the exception of the helical groove in each, and thecircular cylindrical surface of each roller accurately engages thesurface of the respective recess.

1. A device for transforming a rotary motion to a reciprocatory linearmotion, comprising two transversely spaced parallel rollers, meansdrivingly to connect the rollers to rotate in synchronism, a helicalguiding groove in each roller, a guide member mounted between therollers for reciprocation parallel thereto, a drive pin mounted on theguide member for reciprocation transversely of the rollers, means forshifting the drive pin at the ends of its strokes so that the pindrivingly engages the groove in one roller during the forward stroke ofthe guide member and drivingly engages the groove in the other rollerduring the reverse stroke of the guide member, and means at thelongitudinally opposite ends of the device for stopping the guide memberat the ends of its operative strokes, the means for shifting the drivepin so that it alternately engages the grooves in the opposite rollerscomprising means on the driving pin engaged by the respective stop meansat the ends of the operative strokes of the guide member.
 2. A deviceaccording to claim 1, wherein the drive pin has a passage therethroughdirected parallel to the rollers, and wherein the confronting axiallyinner ends of the stop members are bevelled in opposite directions, thepeaks of the stop members being receivable within the passage in the pinwhereby to thrust the pin in opposite directions at the ends ofsuccessive operative strokes of the guide member.
 3. A device fortransforming a rotary motion to a reciprocatory linear motion,comprising two transversely spaced parallel rollers, means drivingly toconnect the rollers to rotate in synchronism, a helical guiding groovein each roller, a guide member mounted between the rollers forreciprocation parallel thereto, a drive pin mounted on the guide memberfor reciprocation transversely of the rollers, and means for shiftingthe drive pin at the ends of its strokes so that the pin drivinglyengages the groove in one roller during the forward stroke of the guidemember and drivingly engages the groove in the other roller during thereverse stroke of the guide member, the guide member having twooppositely disposed recesses, one at each of its transverse ends, saidrecesses accurately receiving the respective rollers whereby the rollersguide the guide member in its reciprocation.
 4. A device according toclaim 3 wherein the recesses have part-circular cylindrical guidingsurfaces disposed with their axes parallel to the axes of the rollers,the rollers are of circular cylindrical configuration with the exceptionof the helical groove in each, and the circular cylindrical surface ofeach roller accurately engages the surface of the respective recess.